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spectre uv-visible



  1. #1
    bleu ciel

    Angry spectre uv-visible

    salut les ami(e)s
    j'ai besoin de l'allure du spectre uv-visible du Barban (Barbane en francais) qui est un pesticide herbicide . Merci

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  3. #2
    HarleyApril

    Re : spectre uv-visible

    bonjour

    regarde là :
    http://riodb01.ibase.aist.go.jp/sdbs...x.cgi?lang=eng

    cordialement

  4. #3
    bleu ciel

    Re : spectre uv-visible

    mercii , mais j'ai pas compris comment fonctionne ??!!

  5. #4
    invite2313209787891133
    Invité

    Re : spectre uv-visible

    Peut être que je m'y prend mal aussi, mais je ne trouve aucun spectre UV sur ce site.

  6. #5
    ArtAttack

    Re : spectre uv-visible

    Je n'y vois que les spectres MS et IR, c'est déjà pas mal.

  7. A voir en vidéo sur Futura
  8. #6
    invite2313209787891133
    Invité

    Re : spectre uv-visible

    Sauf quand c'est précisément un spectre UV-visible que l'on veut trouver...

  9. Publicité
  10. #7
    ArtAttack

    Re : spectre uv-visible

    Je disais c'est déjà pas mal dans le sens où beaucoup de bases de données spectrales sont payantes.

  11. #8
    invite2313209787891133
    Invité

    Re : spectre uv-visible

    Oui j'ai bien compris, mais l'auteur a demandé un spectre UV ; tu dirais quoi si tu allais allais chez Nicolas chercher une bouteille de château Latour et que le vendeur te dise "non, on a plus de vin, mais on a 200 sortes de bières; c'est déjà pas mal".

  12. #9
    ArtAttack

    Re : spectre uv-visible

    Je suis de Bordeaux donc y a toujours du vin. Mais 200 sortes de bières c'est effectivement déjà pas mal

  13. #10
    bleu ciel

    Re : spectre uv-visible

    oh les amis ! merciiii

  14. #11
    HarleyApril

    Re : spectre uv-visible

    effectivement, il n'y a pas de spectre UV sur ce site
    désolé

    pour essayer de me faire pardonner, je t'ai fait un peu de biblio
    si tu peux accèder à l'un de ces papiers, tu auras au minimum une méthode contenant une longueur d'onde où le produit absorbe (c'est peut-être ça ton problème ?)
    Analytic Laboratory Methods:
    GENERAL SAMPLE, SPECTROPHOTOMETRY @ 550 NM.
    [Sunshine, I. (ed.). CRC Handbook of Analytical Toxicology. Cleveland: The Chemical Rubber Co., 1969., p. 501] **PEER REVIEWED**

    RESIDUES: PLANT PORTIONS ARE HYDROLYZED WITH REFLUXING AQ SODIUM HYDROXIDE. ALL BARBAN RESIDUES ARE CONVERTED TO 3-CHLOROANILINE WHICH IS SEPARATED BY STEAM DISTILLATION. THE 3-CHLOROANILINE IS DIAZOTIZED AND COUPLED WITH N-1-NAPHTHYLETHYLENEDIAMINE. THE RESULTING PINK DYE IS ISOLATED ON A CELLULOSE COLUMN AND QUANTITATED BY ITS ABSORBANCE AT 550 NM.
    [Spencer, E. Y. Guide to the Chemicals Used in Crop Protection. 7th ed. Publication 1093. Research Institute, Agriculture Canada, Ottawa, Canada: Information Canada, 1982., p. 31] **PEER REVIEWED**

    /Barban/ analysis is by UV spectrometry. Residues may be determined by HPLC or by hydrolysis to 3-chloroaniline derivatives of which are measured by GC.
    [Worthing, C.R. and S.B. Walker (eds.). The Pesticide Manual - A World Compendium. 8th ed. Thornton Heath, UK: The British Crop Protection Council, 1987., p. 48] **PEER REVIEWED**

    Barban was among a number of pesticides determined in fruit and vegetables by HPLC.
    [Bahig ME, Schmidt E; Isot Radiat Res 14 (1): 43-8 (1982)] **PEER REVIEWED**

    Relative retention time and barban GC was reported. TLC employing silica gel plates, GC employing 3% OV-1 on Chromosorb W-HP, and reversed-phase HPLC. employing octadecylsilanized columns were described.
    [Daldrup T et al; Fresenius Z Anal Chem 308 (5): 413-27 (1981)] **PEER REVIEWED**

    Multi-stage liquid chromatography was used to determine barban residues in fruits and vegetables. With this method detection limits far below the maximum permissible level were achieved even in complex plant extracts.
    [Fogy I et al; Z Lebensm-Unters-Forsch 173 (4): 268-74 (1981)] **PEER REVIEWED**

    Use of 214 nm and 229 nm discrete-line sources for the UV absorbance detection of some pesticides including barban separated by HPLC. The 2 fixed wavelengths generally produced better results on a signal-to-noise basis over most of the region for the cmpd studied.
    [Lawrence JF; J Chromatogr 211 (1): 144-9 (1981)] **PEER REVIEWED**

    A sensitive multiresidue method was presented for the determination of 7 neutral herbicides including barban in natural waters, with practical detection limits between 5-100 ng/l (ppt).
    [Lee H-B, Chau AS Y; J Assoc Off Anal Chem 66 (3): 651-8 (1983)] **PEER REVIEWED**

    A sensitive GC method was developed for the multiresidue determination of 7 herbicides, including barban, in the sediment. ECD was used for the analysis except for atrazine. Recoveries of the herbicides from fortified sediment samples at 3 levels were generally more than 80%. The practical detection limit of this method was 1 ppb or 1 ng/g based on a 50 g sediment sample.
    [Lee H-B, Chau AS Y; J Assoc Off Anal Chem 66 (6): 1322-6 (1983)] **PEER REVIEWED**

    Determination of barban residues in plant material by using alkaline hydrolysis, steam distillation, cellulose chromatography and spectrophotometry. Sensitivity is 0.04 ppm.
    [FDA Pesticide Analytical Manual Vol 2 (Oct) (1989)] **PEER REVIEWED**

    EPA Method 3540. Soxhlet Extraction. A solid sample is mixed with anhydrous sodium sulfate and extracted using an appropriate solvent in a Soxhlet extractor. The sample is then dried and concentrated using a Kuderna-Danish apparatus. This is a procedure for extracting nonvolatile and semivolatile organic compounds from solids such as soils, sludges, and waste.
    [USEPA; Test Methods for Evaluating Solid Waste SW-846 (1986)] **PEER REVIEWED**

    EPA Method 3550. Sonication Extraction. A 2- to 3-g solid sample is mixed with anhydrous sodium sulfate to form a free-flowing powder, then solvent extracted using a horn-type sonicator, followed by vacuum filtration or centrifugation for organic components of equal or less than 20 mg/kg. This method is applicable to the extraction of nonvolatile and semivolatile organic compounds from solids such as soils, sludges, and waste. Interferences include chlorofluorocarbons and methylene chloride.
    [USEPA; Test Methods for Evaluating Solid Waste SW-846 (1986)] **PEER REVIEWED**

    Method: AOAC 992.14; Procedure: liquid chromatographic method with ultraviolet detector; Analyte: barban; Matrix: finished drinking water; Detection Limit: low-mid ppb (ng/mL) range.
    [Horwitz W, ed.; Official Methods of Analysis of AOAC International 17th ed. (2003). CD-ROM, AOAC International, Gaithersburg, MD] **PEER REVIEWED**

    Method: EPA-OSW 8270D; Procedure: gas chromatography/mass spectrometry; Analyte: barban; Matrix: solid waste matrices, soils, air sampling media and water; Detection Limit: 200 ug/L.
    [National Environmental Methods Index; Analytical, Test and Sampling Methods. Barban (101-27-9). Available from, as of February 1, 2005: http://www.nemi.gov **PEER REVIEWED**

    Method: 8321A; Procedure: high performance liquid chromatography with thermospray-mass spectrometry and/or ultraviolet /detection/; Analyte: barban; Matrix: wastewater, ground water, and soil/sediments; Detection Limit: 0.10 ug/g (soil), 2.4 ug/L (water).
    [[U.S. Environmental Protection Agency. Solid Waste Test Methods SW-846 with Update III. CD-ROM (ISO 9660, V381SW8). Solutions Software Corp (1998)]] **PEER REVIEWED**

    Method: EPA 632; Procedure: high performance liquid chromatography; Analyte: barban; Matrix: municipal and industrial wastewater; Detection Limit: 0.05 ug/L.
    [U.S. Environmental Protection Agency. EPA Methods and Guidance for Analysis of Water. CD-ROM, Version 2.0 (ISO 9660-2, V393EPAW). Solutions Software Corp (1999)] **PEER REVIEWED**

  15. #12
    bleu ciel

    Re : spectre uv-visible

    Salut HarleyApril, Mercii

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